US2470027A - Pulse-time modulator - Google Patents

Pulse-time modulator Download PDF

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Publication number
US2470027A
US2470027A US730090A US73009047A US2470027A US 2470027 A US2470027 A US 2470027A US 730090 A US730090 A US 730090A US 73009047 A US73009047 A US 73009047A US 2470027 A US2470027 A US 2470027A
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US
United States
Prior art keywords
voltage
oscillator
source
output
pulse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US730090A
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English (en)
Inventor
Goldberg Harold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR961895D priority Critical patent/FR961895A/fr
Application filed by Bendix Aviation Corp filed Critical Bendix Aviation Corp
Priority to US730090A priority patent/US2470027A/en
Priority to GB4956/48A priority patent/GB653824A/en
Application granted granted Critical
Publication of US2470027A publication Critical patent/US2470027A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal

Definitions

  • This invention is directed to pulse-time modulation. More specifically it is directed to an arrangement for producing pulse-position modulation of the output of a blocking oscillator in accordance with an applied control signal.
  • Fig. l illustrates the preferred embodiment of this yinvention comprising a pulse-time modulated pulse generator
  • Fig. 2 illustrates a simplied embodiment'of the Fig. 1 arrangement.
  • a .blocking oscillator comprising a .vacuum tube I0,
  • The-control electrode 22 of a second vacuum tube 23 isconnected to the output terminal 2
  • the anode 'of the tube 23 is directly connected to a source of voltage indicated +B. and the cathode thereof is connected to the control electrode 26 of a third tube 21.
  • the cathode of the tube 21 is connected to the junction of the winding I5 and the resistor I9.
  • the anode of the tube 21 is connected to a source of voltage +B.
  • lThe anode of a fourth vacuum tube 28 is connected to a source of voltage +B through a resistor 29 and to the junction'of the cathode of the tube 23 and the control electrode 26 through a resistor 30.
  • inclusive comprises a conventional blocking oscillator capable of being synchronized to' an external control signal which might be injected atthe junction of the resistor I9 and the winding I5,
  • the resistor is the output load impedance of the cathodefollower driver comprising the tube 21 which is, in turn, driven by the amplifier comprising the tube 28.
  • Signals applied to the control electrode 26 of thecathode follower stage appear across the resistor I9 in th'e conventional manner, and it is the amplitude of this signal voltage', together with the time constant of the condenser-resistor network I6, I1 which determines the instant-of operation of the blocking oscillator as the charge on the condenser I6 decreases* 'i l y
  • the condenser I6 chargestoa-'fixed voltage during each youtput pulse 'due to the instantaneous conduction of the tube 23, thel control electrode 22 of which receives a portion of the output signal from the output terminal 2
  • the conduction offthev tube 23 eectively clamps the 'control electrode 26 to the voltage' '+Bvduring the blocking oscillator pulse, and thevvoltage acrossthe resistor I0 is brought to a 'fixed 'referencevvalue' during each cycle. This potential each time it charges, irrespective of the magnitude of the signal voltage being supplied by the tube 28 at that instant.
  • is shown as the charging impedance for the condenser I6.
  • the thyratron 3l is normally in a non-conductive state, but fires during the output pulse.
  • a blocking oscillator having an input circuit; a source of modulating voltage; means applying said voltage to said input circuit to control the recurrence frequency of the output impulses of said oscillator; and means for establishing a, reference voltage in said input circuit at the termination of each cycle of the output of said oscillator; the last named means comprising a source of said reference voltage, means constituting a normally interrupted coupling path between the last named source and said input circuit, and means utilizing the output of said oscillator to complete said path during each impulse of said output.
  • a blocking oscillator having an input circuit, a source of modulating voltage, means applying said voltage to said input circuit to control the recurrence frequency of the output impulses of said oscillator, and means for establishing a reference voltage level in said input circuit, the last named means comprising a source of voltage of said reference level and a circuit coupling said reference voltage source to said input circuit, said coupling circuit comprisin8 -,a normally non-conducting space discharge device and means applying the output of said oscillator to said device to render it conducting during each impulse of said output.
  • source of modulating voltage means applying said voltage to the input of said oscillator to control the recurrence frequency of the output impulses thereof, a source of reference voltage, means coupling said source of reference voltage to the input of said oscillator, a switching means normally interrupting said coupling means and means applying the output of said blocking oscillator to said switching means whereby said coupling means is completed during each impulse in the output of said oscillator.
  • a blocking oscillator means applying said voltage to the input of said oscillator to control the recurrence frequency of the output impulses thereof, a source of reference voltage, means coupling said source of reference voltage to the input of said oscillator, said coupling means including the space discharge path of an electric discharge device having a control electrode, and means applying the output of said oscillator to said control electrode, whereby said ⁇ space discharge path is completed during each impulse of the output of said oscillator.
  • a pulse-position modulated pulse generator comprising in combination a blocking oscillator; said oscillator including a vacuum tube having a control electrode, and a condenser connected to said control electrode and having the output of said tube coupled thereto whereby said condenser is charged during the generation of an output impulse by said oscillator; a source of modulating voltage; means coupling said source to said condenser whereby the recurrence frequency .of the output impulses oi said oscillator becomes a function of said modulating voltage;
  • a pulse-position modulated pulse generator as claimed in claim 5, wherein the means coupling the source of modulating voltage to the condenser comprises an electron discharge tube having a cathode and a control electrode, said cathode being connected to said condenser and said source being coupled to said control electrode, and wherein the cathode of the electric discharge device is connected to said control eleca trode.
  • a pulse-position modulated pulse generator comprising a blocking oscillator having an input circuit; ⁇ a source of modulating voltage; means applying said voltage to said input circuit to control the recurrence frequency of the output impulses of said oscillator; and means for establishing a reference voltage in said input circuit at the termination of each cycle of the output of said oscillator; the last named means comprising a source of reference voltage, means constituting a normally interrupted coupling path between the las-t named source and said input circuit, said path including an electron discharge tube having a control electrode and a cathode, said control electrode being coupled to the last named source and said cathode being connected to said input circuit, and means utilizing the output of said oscillator to complete said path during each impulse of said output.
  • a pulse-position modulated pulse generator comprising a blocking oscillator having an input circuit; a source of modulating voltage; a source of reference voltage; an electron discharge tube having a control electrode and a cathode, means connecting said cathode to said input circuit, means including an impedance connecting said source of modulating voltage to said control electrode, means coupling said source of reference voltage to a point on the last named connecting means between said impedance and said control electrode, said couplingl means including the space discharge path of a normally non-conducting electric discharge device, and means applying the output of said oscillator to said discharge device to render the same conducting during each impulse of the output of said oscillator.
  • Patent 0 by the assignee, Bendix to 5, inclusive, of said patent.

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US730090A 1947-02-21 1947-02-21 Pulse-time modulator Expired - Lifetime US2470027A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR961895D FR961895A (is") 1947-02-21
US730090A US2470027A (en) 1947-02-21 1947-02-21 Pulse-time modulator
GB4956/48A GB653824A (en) 1947-02-21 1948-02-19 Electric pulse-time modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US730090A US2470027A (en) 1947-02-21 1947-02-21 Pulse-time modulator

Publications (1)

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US2470027A true US2470027A (en) 1949-05-10

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US730090A Expired - Lifetime US2470027A (en) 1947-02-21 1947-02-21 Pulse-time modulator

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FR (1) FR961895A (is")
GB (1) GB653824A (is")

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548953A (en) * 1948-06-18 1951-04-17 Hughes Henry & Son Ltd Electric pulse generating circuit
US2585929A (en) * 1949-06-10 1952-02-19 Gen Electric Synchronizing system for resonant circuit oscillators
US2887579A (en) * 1953-11-19 1959-05-19 Gen Precision Lab Inc Pulse repetition frequency generator and driver
US3040273A (en) * 1958-04-28 1962-06-19 Hewlett Packard Co Voltage to frequency converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230926A (en) * 1939-04-13 1941-02-04 Philco Radio & Television Corp Timing signal circuits
US2266154A (en) * 1939-02-25 1941-12-16 Emi Ltd Thermionic valve circuits
US2398097A (en) * 1943-07-17 1946-04-09 Conn Ltd C G Phase modulation method and apparatus
US2409577A (en) * 1943-12-03 1946-10-15 Rca Corp Synchronized blocking oscillator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266154A (en) * 1939-02-25 1941-12-16 Emi Ltd Thermionic valve circuits
US2230926A (en) * 1939-04-13 1941-02-04 Philco Radio & Television Corp Timing signal circuits
US2398097A (en) * 1943-07-17 1946-04-09 Conn Ltd C G Phase modulation method and apparatus
US2409577A (en) * 1943-12-03 1946-10-15 Rca Corp Synchronized blocking oscillator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548953A (en) * 1948-06-18 1951-04-17 Hughes Henry & Son Ltd Electric pulse generating circuit
US2585929A (en) * 1949-06-10 1952-02-19 Gen Electric Synchronizing system for resonant circuit oscillators
US2887579A (en) * 1953-11-19 1959-05-19 Gen Precision Lab Inc Pulse repetition frequency generator and driver
US3040273A (en) * 1958-04-28 1962-06-19 Hewlett Packard Co Voltage to frequency converter

Also Published As

Publication number Publication date
GB653824A (en) 1951-05-23
FR961895A (is") 1950-05-24

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